Pool & Spa Plumbing Calculator

Size pool plumbing and equipment

Pool Type

Pool Dimensions

Length (ft)

Width (ft)

Avg Depth (ft)

Turnover Time (hours)

Piping Layout

Equipment Distance from Pool (feet)

Head Elevation (ft above water)

Pool Plumbing Results

Pool Volume --

Required Flow Rate --

Recommended Pump --

Suction Pipe Size --

Return Pipe Size --

Filter Size --

Pipe Velocity Limits

Application	Max Velocity
Suction (gravity)	6 ft/sec
Suction (flooded)	8 ft/sec
Discharge/Return	10 ft/sec
Main drain	3 ft/sec (VGB)

Pool Equipment Guidelines

Pump Selection

Size for design flow + 20%
Variable speed saves energy
Self-priming for above-grade
Match motor to electrical

Filter Sizing

Sand: 15-20 GPM/sq ft
Cartridge: 0.375 GPM/sq ft
DE: 2 GPM/sq ft
Size for 2× design flow

Safety Requirements

VGB compliant drains
SVRS or dual drains
GFCI protection
Bonding and grounding